<!-- homepage part -->
<div class="main-1">
    <div class="rule-1">Hello, world!</div>
    <div class="rule-2">Hello, world!</div>
    <div class="rule-3">Hello, world!</div>
</div>
<div class="main-2">
    <div class="rule-4">Hello, world!</div>
    <div class="rule-5">Hello, world!</div>
    <div class="rule-6">Hello, world!</div>
</div>